Pipe-elbow holder for screw-threading machines



' (No Model.)

1?. P. VOIGT.

PIPE ELBOW HOLDER FOR SCREW THEREADING MACHINES. No. 424,519. Patented Apr. 1,1890.

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PIPE-ELBOW HOLDER FOR SCREW-THREADING MACHINES.

SPECIFICATION forming part of Letters Patent N 0. 424,519, dated April 1, 1890.

Application filed February 2 1,1 8 88.

To all whom it may concern:

Be it known that I, FERDINAND F. VOIGT, a citizen of the United States, residing in Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Pipe- Elbow Holders for Screw-Threading Machines, of which the following is a specification.

This invention relates to improvements in pipe-e1bow holders especially designed for use in connection with screw-threading machines for threading the ends of sheet-metal pipes, by means of which a close and rigid but detachable joint between sections of stove or other pipe is provided.

Prior to this invention, so far as I am aware, pipe-l1olders have not been adapted to, and in fact could not possibly, hold an elbow during the threading operation, because of the necessary rotation or swinging of the elbow about the beading-rollers; hence before my present invention screw-threaded elbows were unknown in the art, and as a result screwthreaded straight sections of pipe have been used to but a limited extent, not only because of their unfinished and unusual appearance when connected by the old form of elbow with a slip-joint, but also because the resultant concentration of all lateral strains upon the elbow-joints would negative all the advantages gained by making a comparatively rigid joint between the straight sections of the pipe, for the usual fastenings for suspending the pipe would have to be employed in connection therewith.

The prime object of this invention is to which an elbow may be held in proper position during the operation of forming screwthreads on the ends thereof.

Another object is to have a pipe-holder in which an elbow may be held so as to rotate upon or about the axis of either end thereof.

A further object is to have such a pipe-elbow holder capable of a lateral and vertical adjustment, whereby the angle of pitch of the thread may be varied and elbows of different sizes may be operated upon.

Further objects are to have a pipe-holder capable of a lateral and vertical adjustment, in which may be held during the operation of threading either a straight section. or elbow Serial No. 264,747. (No model.)

of pipe, to have the pipe-elbow holder so constructed as to materially facilitate the insersion or removal of the elbows therefrom, and to provide certain details of construction in the carrying out of my invention, all as illustrated in the accompanying drawings, in which Figure 1 represents a side elevation of a screw-threading machine containing a pipeholder embodying my invention; Fig. 2, a detail plan view of the pipe-holder, showing the same open for insertion of the pipe; Fig. 3, a front elevation thereof; Fig. 4:, a transverse section thereof through the automatic catch; Fig. 5, an elevation of a double-ended pipeholder for holding two elbows; Figs. 6 and 7, detail views showing modified forms of holders.

Similar letters of reference indicate the same parts in the several figures of the drawings.

Screw-threading straight sections of sheetmetal pipe by machinery is well known in the art, and one of the machines for performing that operation and upon which this invention is particularly designed as an improvement is fully shown and described in United States Letters Patent No. 369317, granted me September 6, 1887. As I prefer in connection with my present invention to employ the machine shown in that patent in its entirety, I need not herein dwell at length upon the detailed construction thereof, as illus trated in the general view, Fig. 1, of the accompanying drawings, but will briefly state that it consists, generally, of a standard A, in the head-frame B of which are jou rnaled short shafts C D, carrying on their ends, respect ively, grooved. and beaded rollers E F for forming the thread upon the pipe, to which power is applied by means of the crank-handle G, secured to the opposite end of the shaft D, although it is obvious that the crank might be as well secured to the shaft C or entirely dispensed with and belt pulleys or other devices substituted for applying power. The shafts O D are suitably geared together, so as to rotate in unison.

The standard A is secured to a work-bench or a table II, upon which is also mountedthe pipe-holder, consisting of a trough I, extending substantially parallel to the axes of the shafts O D, and supported upon screw-jacks J for elevating and lowering the same, said jacks in turn being secured in an upright position upona base-board K, which latter is secured to a laterally-adj ustable guide-board L, pivoted to the table or bench.

Between the base and the side edges of the guide-board is formed a tongue-and-groove connection for enabling the longitudinal adj ustment of the trough toward and away from the beading-rollers, according to the length of the pipe-section, while the pivot-connection between the guide-board and table permits a lateral adjustment of the trough relative to the beading-rollers, by means of which the angle of pitch of the thread'to be formed upon the pipe may be varied, the rear end of the guide-board being connected with the table in such manner that the said board may be secured at any point of its adjustment.

Thus far the, machine is identical with that of my aforesaid patented machine, except some minor details, which may or may not be employed, and it is evident that such a machine is not adapted and cannot possibly hold an elbow during the operation of forming the thread 011 the ends thereof any more than any of the prior machines for a similar purpose of which I am aware. This invention is particularly intended to cure this defect in the old form of machines, or, rather, add a new function to the old machines, without in any manner detracting from or interfering with the functions of such machine; and to this end is provided an elbow-holder, consisting, preferably, of a hollow cast frame M, formed on the arc of a circle and cut axially, so as to form two parts N 0, each of which is secured to and supported upon half-sections P Q of a cylinder, also cut axially and constituting the shank of the holder, the two parts of said shank being united at their side edges by hinges R near the ends thereof, in such man her that when folded together they form a complete cylinder, while the sections of the elbow-holder also come together in the same way, but form a quadrant of a hollow cylinder, into which the elbow is inserted and held during the screw-threading operation. It is immaterial whether the shank be hollow or solid, so long as means are provided for securing the elbow-holder thereto, and it may, if desired, be cast with the elbowholder it self, or it may have such a skeleton structure as is shown in Fig. 6, the object of which is to lessen the weight of the device as a whole, and at the same time provide for hinging the section thereof upon axes transverse to the shank thereof, so that only the holder need be divided, while the shank may be a complete cylinder. Thetwo parts of the shank of the preferred construction are united, as before stated, at one side edge by means of the hinges R, and, when brought together so as to form a cylinder,are held in that position by the spring-catch S, secured to one sec-=- tion and engaging the other, or by some equivalent device. This shank lies and works in the trough I, by which it is supported and in which it is free to have bot-h an axial rotation and an endwise or longitudinal movement, being of sufficient length to balance the holder and contents and have such endwise movement without being withdrawn from the trough. It will be understood that the shank alone rests in the trough, so that the elbow and holder may revolve forward of the trough, the horizontal arm of the elbow and holder and the shank having a common axis, and it is equally apparent that when the shank is placed in the trough the elbow-holder may be manipulated in exactly the same manner as a piece of'pipe laid therein, and all the movements of the old holder imparted thereto for operating upon various-sized pipe at different angles without altering the old machine in the slightest degree.

The holder shown in Fig. 5 is simply a duplication of the holder shown in Fig. 1 upon the opposite ends of the shank, and is particularly designed for use in large shops, so that two elbows may be inserted and removed at the same time, and thus reduce the amount of work required in handling.

Instead of the shank having a rigid connec tion with the holder, as shown, a swivel-com nection such as is shown in Fig. 7 may be provided, in which case the holder would be the only part to revolve during the threading operation, the shank, however, though not revolving, having an endwise or sliding bearing in its support, so as to permit the feed of the pipe to the beading-rollers.

Having described my invention, what I claim, and desire to secure by Letters Patent, is-

1. In a machine for screw-threading sheetmetal pipe, an elbow-holder conforming in shape to an elbow, revolubly supported and constructed to hold the elbow with one of its arms in a line with the axis of the support upon which the holder revolves, substantially as described.

2. In a machine for-screw-threading sheetmetal pipe, an elbow-holder conforming in shape to the elbow, comprising two sections hinged or pivotally connected together, in

combination with means for revolubly supporting the holder or the axis of one arm of the elbow, substantially as described.

3. In a machine for screw-threading sheetmetal pipe, the combination of an elbow-' metal pipe, the combination of an elbowi holder, conforming in shape to an elbow and havlng a shank in line with one arm of the elbow-holding portion, a support alfording a sliding bearing for the shank of the holder, and means for adjusting said support laterally, substantially as described.

' 5. In a machine for screw-threading sheetmetal pipe, the combination of an elbowholder, conforming in shape to an elbow and having a shank in line with one arm of the elbow-holding port-ion, a support affording a sliding bearing for the shank of the holder, and means for adjusting said support laterally and vertically, substantially as described.

6. In a machine for screw-threading sheetmetal pipe, the combination, with a table, the beading-rollers, and a support therefor mounted on said table, of an elbow-holder conform ing in shape to an elbow and having a shank in line with one arm of the elbow-holding portion, a trough affording a sliding bearing for the shank of the holder, a pivot-connection between said trough and table, and meansfor Vertically and longitudinally adjusting said trough, substantially as described.

7. In a machine for screw-threading sheetmetal pipe, a two-part elbow-holder provided With a shank having a common axis with one arm of said holder, and a support for said shank, substantially as described.

FERDINAND F. VOIGT.

Witnesses:

W. W. ELLIOTT, WILL R. OMOHUNDRO. 

